FILE - In this April 23, 2008 file photo, a Metra commuter train passes through a railroad crossing in Chicago's Beverly neighborhood. U.S. Rep. Daniel Lipinski, D-Ill., says public transit agencies ... more 
FILE - In this April 23, 2008 file photo, a Metra commuter train passes through a railroad crossing in Chicago's Beverly neighborhood. U.S. Rep. Daniel Lipinski, D-Ill., says public transit agencies nationwide are being targeted with questionable lawsuits by "patent trolls" that are squeezing settlements out of financially strapped public entities unable to mount legal defenses. Lipinski says at least 20 public transit agencies, including the Chicago area's Metra, have been targeted. (AP Photo/M. Spencer Green, File) less 
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Associated Press | Photo By M. Spencer Green, File
Thu, Jun 27, 2013 2:47 PM EDT